250 INSECTA. 



Other entomologists restrict this generic appellation to those spe- 

 cies in which the antennae are remote and abruptly inflated, in which 

 the mandibles exhibit no projection on the inner side, and where all 

 the cubital cells are sessile. 



They are the true Philanthi, or 



Philanthus, Lat. — Simblephilus, Jur. * 

 Those, in which the antennae are approximated, much longer than 

 the head, and gradually enlarge ; where the inner side of the mandi- 

 bles presents a dentiform projection, and the second cubital cell is pe- 

 tiolate, form the subgenus 



Cerceris, Lat. — Philanthus, Jur. f 

 FAMILY III. 



DIPLOPTERA. 



The third family of the Aculeata is the only one of that section, in 

 which, with but few exceptions (Ce/-ammsJ, we find the superior 

 wings folded longitudinally. The antennae are usually geniculate 

 and clavate, or thickest at the end. The eyes are emarginated. The 

 prothcrax is prolonged behind, on each side, to the margin of the 

 wings. In the superior of the latter organs are three or two closed 

 cubital cells, the second of which receives the two recurrent ner- 

 vures. The body is glabrous or nearly so, and black, more or less 

 maculated with yellow, or fulvous. 



Many of these Insects form temporary communities composed of 

 three sorts of individuals, males, females, and neuters or mules. Such 

 of the females as survive the severity of the winter, commence the 

 nest and take care of the larvse. They are subsequently assisted by 

 the neviters. 



We will divide the Diploptera into two tribes. 



The type of the first, that of the Masarides, Lat., is the genus 



Masaris, Fab. 



The antennae at the first glance seem to be composed of but eight 

 joints, the eighth, Avith the following ones, forming an almost indis- 

 tinctly articulated club, rounded or very obtuse at the end. The 

 ligula is terminated by two threads which can be withdrawn into a 

 tube formed by its base. There are but two complete cubital cells in 



* Lat., Ibid., 95. The genus Trachijpus, Kliig, differs but little from this one. The 

 first ring of the abdomen is proportionally more elongated, narrower, and almost 

 forms a pedicle, as in Psen. 



t Lat., Ibid., 93. In the Ann. d'Agricult., LIII., Bosc has published some 

 observations on the habits of certain species of this subgenus. 



